Melbourne’s performing arts hub offers backstage tours every Sunday, offering visitors behind-the-scenes access to the State Theatre, Fairfax Studio, Playhouse and Hamer Hall. On the tour you can see costumes, sets and props from current productions, visit the stars’ dressing rooms and even make your own stage debut at some of Melbourne’s most famous performing spaces. But the truly rare, hidden secret at Arts Centre Melbourne is the extensive Performing Arts Collection, and you can only see that during Open House Melbourne. The space is deep inside Hamer Hall, behind a secret door, and it houses more than 610,000 items of performance art history: such treasures as Dame Nellie Melba’s costume wardrobe, Kylie Minogue’s costumes and red-carpet looks, and three-dimensional set models for shows. A particular highlight is Barry Humphries’ Dame Edna archives – it includes not only ornate and elaborate costumes (many with working parts) but also some marked-up scripts. There are six tours of the Performing Arts Collection running each day of Open House Melbourne weekend. Numbers are very limited – just 15 or so lucky Melburnians get to go on each one. 100 St Kilda Rd, Melbourne 3004.